Worst air pollution Viterbo, today and tomorrow
Today (9 August): Air quality in Viterbo is medium. AQI, NO2, and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 AM (NO2: 50.3/100).
Tomorrow (10 August 2026): Air quality in Viterbo is medium. All pollutants stay as today. Pollution peaks around 5:00 PM (O3: 56.3/100). Airmine updates local air quality forecasts four times daily.
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Viterbo's air quality reflects the Viterbo plain at the edge of the volcanic Cimini hills in northern Lazio, with vehicle traffic on the A1 motorway and surrounding thermal spa, agriculture, and manufacturing contributing local sources. The Cimini hills and the Monti Volsini volcanic highlands create topographic variation, while the Tyrrhenian coastal influence provides periodic ventilation and the flat Latium countryside generally maintains moderate conditions throughout the year.
Today - 9 August | Pollution peaks at 03:00
AQI:
Medium
50.3/100
PM2.5 (fine particles):
Good
14.7/100
PM10 (coarse particles):
Good
5.4/100
NO2 (nitrogen dioxide):
Medium
50.3/100
O3 (ozone):
Medium
45.2/100
SO2 (sulfur dioxide):
Good
5.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
13.1/100
PM1 (ultrafine particles):
Good
17.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 17:00
AQI:
Medium
56.3/100
PM2.5 (fine particles):
Good
14.7/100
PM10 (coarse particles):
Good
5.1/100
NO2 (nitrogen dioxide):
Medium
51.4/100
O3 (ozone):
Medium
56.3/100
SO2 (sulfur dioxide):
Good
5.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
17.4/100
PM1 (ultrafine particles):
Good
17.0/100
Pollen forecast in Viterbo
View pollen forecastFrequently Asked Questions
Is air quality bad in Viterbo right now?
On 9 August 2026, overall air quality in Viterbo is medium. AQI is the main air quality indicator at 50.3/100. Pollution peaks around 3:00 AM (NO2: 50.3/100).
Will air quality be worse tomorrow in Viterbo?
On 10 August 2026, air quality conditions in Viterbo will be similar to today, with AQI forecast at medium at 56.3/100. Pollution peaks around 5:00 PM (O3: 56.3/100).
When is air pollution at its worst in Viterbo?
The most noticeable dips in Viterbo's air quality come when oak and linden pollen peaks, or because of vehicle traffic on the A1 motorway and nearby thermal spa, agriculture, and manufacturing; conditions generally improve once the season shifts and rainfall or stronger winds return.
Are air quality levels in Viterbo based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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